Automatic push bar

ABSTRACT

A self-acting locking bolt for doors or the like, more particularly furniture doors, comprising at least one receiving part on one door leaf or frame, and at least one locking part on the other door leaf or on a door leaf, the locking part having a control connecting-link for a pin of a bolt guided so as to be movable vertically in the locking part, the said pin projecting sideways out of the locking part, in that the locking part is substantially flush with the top edge or bottom edge of the door leaf, in that the bolt does not project, or projects only slightly, beyond the top edge of the locking part when the door leaf is in an open position and projects beyond the top edge into a matching location in an associated frame part when the door leaf is in a closed position, and in that the receiving part has a recess with which the pin of the bolt may be brought into engagement in the locking operation and is pushed along the connecting-link guide and in wich the pin is located when the door leaf is closed.

BACKGROUND OF THE INVENTION

This invention relates to a self-acting locking bolt.

If fairly large furniture doors are only locked in the center of thedoor, over the course of time they will warp. To remedy this, it isconventional practice to bolt at least one door leaf, the so-calledfixed door leaf, to the frame at the top and bottom. In recent times acentral locking mechanism using so-called drive rods has also beenadopted.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a locking bolt withwhich, in a simple manner, a fixed door leaf or a moving door leaf canbe secured at the top and bottom in the frame, or to a door leaf in asurround.

These and other objects of the invention are met by a self-actinglocking bolt as described below.

In a self-locking bolt for doors or the like, more particularlyfurniture doors, comprising at least one receiving part on a door leafor frame, and at least one locking part on the other door leaf or on adoor leaf, according to the invention the locking part has a steeringconnecting-link for a pin of a bolt guided so as to be movablevertically in the locking part, the said pin projecting sideways out ofthe locking part, wherein the locking part is substantially flush withthe top edge or bottom edge of the door leaf and the bolt does notproject, or projects only slightly, beyond the top edge of the lockingpart when the door leaf is in an open position, and projects beyond thetop edge into a matching location in an associated frame part when thedoor leaf is in a closed position. The receiving part has a recess withwhich the pin of the bolt may be brought into engagement in the lockingoperation and is pushed along the connecting-link guide, and in whichthe pin is located when the door leaf is closed. The receiving part maybe fitted to the moving door of a double leaf door or in the frame of asingle leaf door.

The bolt is mounted perpendicularly in the locking part andspring-operated in the opposite direction from the frame part. The pinis aligned horizontally in relation to the bolt, and the receiving partand/or the locking part is/are in the shape of a flat parallelepiped,one or more projections being arranged on the reverse side thereof forpinning, secured against rotation, into a furniture part.

On their sides facing towards the frame part, the receiving part and/orthe locking part have resiliently mounted, upwardly rounded snap-actionstuds for releasably snapping into matching recesses in the frame part.The spring for the snap-action stud is mounted on an eccentric discadjustable from the exterior, by which the spring force can be adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below by way of example, withthe aid of the drawings in which:

FIG. 1 shows the receiving part and the locking part in a double leafdoor in a closed position;

FIG. 2 shows the receiving part and the locking part in an openposition.

FIG. 3 is a plan view of the receiving part;

FIG. 4 is a plan view of the locking part;

FIG. 5 is a left side elevation of the receiving part;

FIG. 6 is a front elevation of the receiving part;

FIG. 7 is a front elevation of the locking part;

FIG. 8 is a right side elevation of the locking part;

FIG. 9 is a bottom plan view of the receiving part;

FIG. 10 is a bottom plan view of the locking part;

FIG. 11 is a left side view of the receiving part;

FIG. 12 is a rear elevation of the receiving part;

FIG. 13 is a rear elevation of the locking part; and

FIG. 14 is a left side elevation of the locking part.

DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIG. 1 the self-acting locking bolt is fitted in a double leaf door3, 4. The door is closed. The locking bolt comprises a receiving part 1which is fitted flush in the top right-hand corner in the moving leaf 4,and a locking part 2 which is fitted flush in the top left-hand cornerof the fixed leaf 3. Both parts are flat parallelepipeds and are largelyidentical in structure.

The locking part 2 has a bolt 5, displaceable vertically therein, whichin FIG. 1 is extended and engages at the top in a recess of the frame 10of the door. As may be inferred from FIGS. 7 and 13, the cylindricalbolt 5 has a thickened lower end 5', a compression spring 11 beingsupported on the flange thus formed, surrounding the bolt 5 and havingits upper abutment in a blind hole 12. The compression spring 11 tendsto force the bolt 5 downwards to a stop 2" of a pin 5" on the lateralhousing wall 2' (FIG. 14), which pin is connected to the said bolt andprojects horizontally sideways therefrom, the bolt being fully insertedin the blind hole 12. The bolt 5 emerges at the top through a hole 12'at the top of the blind hole 12 when the pin 5" is moved upwards.

The receiving part 1 has a recess 6 with a catch 6' in which the pin 5"is located, in the closed position represented in FIG. 1. As representedin FIG. 14, the side housing wall 2' has a steering connecting-link 13for the pin 5", which runs obliquely upwards from the stop 2". If themoving leaf 3 is moved towards the fixed door leaf 4 into the closedposition, the tip of the pin 5' which projects horizontally obliquelyforwards towards the recess 6 strikes the rear wall 6" of the recess 6.The pin 5" is guided obliquely upwards against the force of the spring11 along the steering connecting-link 13, producing a rotationalmovement and an axial, upwardly directed movement of the bolt 5 whichengages into the matching recess of the frame part 10, until the closedposition shown in FIG. 1 is reached. Fitting respective locking andreceiving parts at the top and bottom enables simple automatic lockingof the fixed leaf to be achieved.

Correspondingly reversing the elements means that the locking part canalso be fitted on the moving leaf and the receiving part on the fixedleaf. It is also possible to fit the receiving part in a door surroundand accordingly to fit the locking part in the door, so that the doorautomatically self-locks when it closes.

On their upper side facing towards the frame part 10, both the lockingpart and the receiving part have respective resiliently-mountedsnap-action studs 7 which, when the doors are closed, are snapped intomatching recesses in the frame part 10. As may be seen from FIG. 5, thesnap-action stud 7 is mounted in a blind hole 14 on top of a compressionspring 15, and a flange 16 on an inwardly projecting shoulder 17 thereofadjoins the opening of the blind hole 14. When it is snapped into theframe part 10, the snap-action stud is pressed inwards against thespring force. To make this operation easier, it is provided with aspherical cap 7'. Since adjustment of the initial stress of the spring15 is desirable in order to compensate for tolerances, the said springis guided on an eccentrically guided, upright disc 18 in the blind hole14 which is connected to an adjusting disc 8 guided in the receivingpart 1 and protruding outwardly therefrom. Rearwardly, the eccentricdisc 18 is mounted in the receiving part 1 by way of a shaft stub 19.Depending on the position of the eccentric disc 18, the initial stressof the spring 15 is more or less.

The receiving part and the locking part are screwed in place in the doorleaves by way of holes 9 (FIGS. 1 and 2) or they are pinned, securedagainst rotation, into matching recesses of the door leaves by means ofprojections 20, 21 (FIGS. 3, 9-12).

What is claimed is:
 1. A self-acting locking bolt for furniture doors,said locking bolt comprising a receiving part having a recess therein,and a locking part, said locking part comprising a vertically slidablebolt, a pin projecting laterally from said bolt, and a steeringconnecting link for said pin, said locking part being adapted formounting substantially flush with an edge of a door leaf, so that thebolt does not project substantially beyond said edge when the door leafis in an open position,said receiving part being adapted to be mountedon an other door leaf or adjacent frame part so that said recess engagesthe pin of the bolt as the door leaf is closed and is pushed along aconnecting-link guide and in which the pin seats when the door leaf isclosed, wherein the steering connecting link of the locking part isoriented obliquely upward, so that the pin rotates as the door leaf isbeing closed, and, when the door leaf is fully closed, the pin lies insaid recess in the receiving part.
 2. A self-acting locking boltaccording to claim 1, wherein the bolt is spring-operated in a directionaway from the frame part.
 3. A self-acting locking bolt according toclaim 1, wherein the pin extends perpendicularly from the bolt.
 4. Aself-acting locking bolt according to claim 1, wherein the receivingpart has the shape of a flat parallelepiped and wherein the receivingpart has one or more projections for securing the receiving part againstrotation on a furniture part.
 5. A self-acting locking bolt according toclaim 1, wherein the receiving part has upwardly rounded snap-actionstuds for releasable snapping into matching recesses in the frame part.6. A self-acting locking bolt according to claim 5, further comprising aspring for actuating the snap-action studs, and an eccentric disk whichis adjustable from outside of the door for preloading said spring.
 7. Aself-acting locking bolt according to claim 1, wherein the locking parthas one or more projections for securing the receiving part againstrotation on a furniture part.
 8. A self-acting locking bolt according toclaim 1, wherein the locking part has upwardly rounded snap-action studsfor releasable snapping into matching recesses in the frame part.
 9. Aself-acting locking bolt according to claim 8, further comprising aspring for actuating the snap-action studs, and an eccentric disk whichis adjustable from outside of the door for preloading said spring.